Results 181 to 190 of about 1,430 (223)

Assessing the Altimetric Measurement from CYGNSS Data

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The Cyclone Global Navigation Satellite System (CYGNSS) mission was designed to study hurricane intensification by measuring wind speeds in tropical cyclones. However, the delay-Doppler maps (DDM) that are produced can be used to estimate the sea surface height (SSH) at the specular reflection point on the ocean surface.
Zuffada, Cinzia, Haines, Bruce, Hajj, George, Li, Zhijin, Lowe, Stephen, Shah, Rashmi, Mashburn, Jake, Axelrad, Penina, O'Brien, Andrew, Cipollini, Paolo, Zavorotny, Valery, Voronovich, Alexander   +11 more
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An Assessment of CYGNSS Ocean Wind Speed Products

2021
<p>Global Navigation Satellite System-Reflectometry (GNSS-R) is an innovative and rapidly developing approach to Earth Observation that makes use of signals of opportunity from Global Navigation Satellite Systems, which have been reflected off the Earth’s surface.
Hammond, Matthew, Foti, Giuseppe, Gommenginger, Christine, Srokosz, Meric, Floury, Nicolas   +4 more
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Comparing the cygnss simulator forward scattering model with TDS-1 and cygnss on-orbit DDMS

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
The CYGNSS (Cyclone GNSS) Mission is a constellation of 8 micro-satellites successfully launched in December 2016. Each satellite carries a GNSS-R (Global Navigation Satellite System Reflectometry) receiver which forms a Level-1 delay-Doppler map (DDM) measurement of reflected GPS L1 C/A-coded signals off the surface of the Earth.
Andrew O'Brien, Joel T. Johnson
openaire   +1 more source

The CYGNSS nanosatellite constellation hurricane mission

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
The Cyclone Global Navigation Satellite System (CYGNSS) is a spaceborne mission concept focused on tropical cyclone (TC) inner core process studies. CYGNSS attempts to resolve the principle deficiencies with current TC intensity forecasts, which lies in inadequate observations and modeling of the inner core.
Christopher S. Ruf, Scott Gleason, Zorana Jelenak, Stephen Katzberg, Aaron Ridley, Randall Rose, John Scherrer, Valery Zavorotny   +7 more
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On-Orbit Trending of CYGNSS Data

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
Shortly after its launch in December of 2016, the Cyclone Global Navigation Satellite System (CYGNSS) constellation began producing estimates of sea surface wind speeds. With its unique remote sensing method and use of eight satellites, the constellation is able to produce winds with shorter revisit times and in more intense weather than other sea ...
Darren S. McKague, Christopher S. Ruf
openaire   +1 more source

Investigating “rapid revisit” observations of cygnss

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
The Cyclone Global Navigation Satellite System (CYGNSS) mission launched Dec. 2016 and will provide ocean surface wind speed measurements from an eight satellite constellation using GPS reflectometry observations. The nature of CYGNSS coverage results in some locations on Earth experiencing multiple wind speed measurements within a short period of time
Jeonghwan Park, Joel T. Johnson, Andrew O'Brien, Yuchan Yi   +3 more
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Earth antenna temperature variability for CYGNSS

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
Calibration algorithms are being developed for the CYclone Global Navigation Satellite System (CYGNSS) mission in anticipation of a late-2016 launch date. Antenna temperature (TA) of oceanic scenes will be used to confirm the relationship between receiver noise temperature and physical temperature—which will drift over time. In this work, we develop an
Mary Morris, David D. Chen, Christopher S. Ruf   +2 more
openaire   +1 more source

Measuring Ice Thickness with Cygnss Altimetry

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
Cyclone Global Navigation Satellite System (CYGNSS) is collecting GPS signals reflected from two high altitude lakes with ice cover during Winter 2017–2018. Coherent reflections occur at the ice/water interface and carrier phase altimetry is used to estimate the draft of the ice cover. Simulated data are created using a forward model. Signal processing
David Mayers, Chris Ruf
openaire   +1 more source

Global Soil Moisture Estimation Using CYGNSS Data

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
In this paper, an approach for estimating soil moisture (SM) from Cyclone Global Navigation Satellite System (CYGNSS) data is developed. Here, a three-layer model of air, vegetation cover, and soil is proposed. In application, the surface reflectivity along with its statistics are derived from the CYGNSS data and the ancillary vegetation opacity data ...
Qingyun Yan, Shuanggen Jin, Weimin Huang, Yan Jia   +3 more
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Vegetation Optical Depth Retrieval from CYGNSS Data

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
The Cyclone Global Navigation Satellite System (CYGNSS) observation received the Global Positioning System (GPS) signals with a revisit time in the range of 2.8 to 7.2 hours and have about a few kilometers of spatial resolution for coherent reflection and ∼25 km for incoherent reflection [1].
Xiaolan Xu, Simon Yueh, Rashmi Shah, Akiko Hayashi   +3 more
openaire   +1 more source